Turbine bucket-wheel.



R. HILLNER.

TURBINE BUCKET WHEEL.

APPLlCATION FILED JUNE 10. 1914.

Patented 0015.12, 1915,

inventor. Rgdnlibh Hiiiner,

Hisaflttcarngy.

n m w Cit RUDOLYH HILLISTER, O SCHENEUTADY, NEW YURK, ASSIGNCE 'I'O GENERAL ELECTRIC COMIANY, A CORPORATION OF NEW" YUItTEtI.

TURBINE BUGKETWI-IEEL.

specification of Letters Eatent.

Patented @ct. i2, Mil-3..

Application filed June 10, 1914. Serial No. 844,197.

To all whom it may concern:

Be it known that I, RUDOLPH. l'limnuu, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York have invented certain new and useful. Improvements in Turbine Bucket-V fheels, of which the following i a specification.

The present invention relates to rotors for elastic fluid turbines, and particularly to the formation of the bucket bases a'ud the as sembling of the same in the Wheel.

At the present time it is the common practioe to provide the rotor with an undercut slot in the rim into which the bucket bases are introduced through suitable openings in the side or face of the rim, these openings being afterward closed by means of locking pieces or notch blocks. The number of these openings varies with the diameter of the Wheel, from tvo to eight being usually found necessary.

According to the present invention I a oid the use of side or face openings for the introduction of the buckets by forming the bucket buses in such a manner that they I edgewise into the slot and then turned i to engaging position.

For :2. consideration. of what I believe to be novel. and my invention attention is directed to the accompanying specification and the claims appended thereto.

Referring to the drawing wherein. I have illustrated one form which my invention may take, Figure 1 section of a portion of a turbine rotor; Fig. 52 is a. plan View; and Fig. 3 is a perspective showin one bucket in place in the undercut slot and a. spacin piece and second bucket adjacent thereto.

it indicates the periphery of the Web member of a turbine rotor having formed therein the undercut groove or slot 5, the upper edges of'which are beveled indicated at 6. The upper faces (3 of the groove are slightly tapered iii an u nvard direction from the side wall of the groove to its edges.

7 indicates the bucket proper and 8 the base thereof. This base in horimntul section is a parallelograui iith its longer sides of greater length than the width of the slot. The thickness of the base is less than the v rest width of the slot. Formed in the sides of the base are the two notches S), the o l which extend at substantially the is a side View partly in same angle as do the end faces of the base proper. This angle will depend upon the I length of the base as compared to the Width of the slot and will be such that when the base is turned into final position the end faces will. take against the sides of the slot. The faces 9 of the bucket bases are slightly tapered to cooperate with the tapered feces 6, As will. be obvious in order to insert the bucket cases into the slots the same are introduced longitudinally and then turned.

By avoiding the use of side slots for the introduction of the buckets 1 ans. enabled to increase the eiliciency of the rotor since in place of the locking pieces there will be buckets. According to. this invention but one locking piece Will be required. This may take any suitable form and will be located between the first and last buckets to be inserted as will be obvious.

A turbinerotor constructed according to this invention has the further advantage that it may be more quickly and easily assembled, and much more readily repaired. as no special tools are required. This is oi particular advantage in case it is required to reblade the machine after being installed.

in accordance with the provisions of the patent statutes 1 have described the principle of operation of my invention, together with the apparatus Which I now consider to represent the best embodiment thereof; but i desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What- 1 claim as new and desire to secure by Letters .lntent oi the United States. isr

l. The combinatioh with a turbine rotor having an undercut slot with tapered unpersuri'uces upon each side of the mouth slot. oi" a bucket having notch. with tapered sort 5 t; at ta iiei-ed surfaces of I parallelograinmatic in section with its longer sides of greater length than the greatest Width of the slot, and its shorter sides substantially parallel to the side walls of the slot, and of less thickness than the narrcwestwidth of the slot.

2. A turbine rotor comprising "a web Jineniber having an undercut slot in its periphery with tapered upper surfaces upon each side of themouth of the slot, :1 plurality of buckets mounted therein each hav ing a base of less thickness than the narrowest width of thevslot and parallelogrammatic in section with its longer sides of greater length than the maximum Width of Mum.

the slot, and its shorter sides substantially parallel to the side Wall of the slot, said base being provided with tapered surfaces which cocperate with the upper tapered surfaces of the'under-cut slot for wedging the bucket base against the bottom of the 

